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参考UL62中的定义:
: p- Z8 U+ s8 U7 E' k7 C$ rNot-for-hard-usage cord – a cord intended for use with light equipment, classified as the lowest grade' ] Q; M" u& x4 V& X. p' V' l
in mechanical serviceability.7 m* @; {* a* U P1 j' o
Hard-usage cord – a cord intended for use with moderately heavy equipment and for hand-held
( K2 k3 ^$ [# a: Aappliances and tools, classified as the medium grade in mechanical serviceability.
; h* c1 M$ m6 AExtra-hard-usage cord – a cord intended for use with heavy equipment and for hand-held appliances
9 U0 j0 S! F' L" d) e9 eand tools, classified as the highest grade in mechanical serviceability. |
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